Comfort properties of double layered knitted and woven fabrics The study provides comprehensive and informative data on the comfort related material properties of double layered knitted and woven fabrics, produced from engineered polyester, cotton and viscose yams, designed as cover sheets. The knitted fabrics were produced at two different course densities with the top layer consisted of either four channeled polyester (ChPES) yarn or a micro-blend of polyester and cotton (MbPES/CO) yarn, and the bottom layer consisted of either cotton or viscose yam. Woven fabrics were produced at three weft densities with either ChPES or MbPES/CO warp and top weft, and cotton or viscose bottom weft. In order to evaluate and compare the properties of these fabrics, different trials were achieved regarding the wearability comfort of clothing made of these materials. Results showed that ChPES yarns provided better water absorbency and wicking ability, lower thermal conductivity and air permeability, and higher friction. MbPES/CO yarns ion the other hand, presented higher air permeability, lower friction, higher thermal conductivity and lower water absorption and wicking. Whig cotton yams improved the water absorption and wicking, viscose yarns resulted in higher air permeability in knitted fabrics. In addition, at high course and weft densities water absorption, water wicking and heat transfer were high, and air permeability was low.